The best place I know for asking questions about Christmas lights is https://www.planetchristmas.com/. There was a discussion recently about the quality of lights from Home Depot and Walmart. I don’t remember which were best. Both places have sales this weekend on Christmas decorations. Most of the LED lights I own were scavenged from thrift stores. They last for years. I have a couple of strings of C9 bulbs that have a 2008 manufacturing date on the tag that comes with the lights. They work flawlessly and haven’t faded as some incandescent lights do.

There are people on Planet Christmas who’s displays use over 20,000 lights. When you compare a string of incandescent lights that consume 70W versus a similar LED string that uses 4.8W you can see a good reason for using LEDs. I have a couple of strings that use RGB lights and change colors without using a controller.